Journal
PHYSICS LETTERS A
Volume 373, Issue 37, Pages 3354-3358Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2009.07.031
Keywords
Graphene nanoribbon; Defect; Magnetic moment; Energy gap
Categories
Funding
- 973 Program [2007CB936204]
- National NSF [10732040]
- Jiangsu Province NSF [BK2008042]
- MOE of China [IRT0534]
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The electronic and magnetic properties of zigzag graphene nanoribbons (ZGNRs) with Stone-Wales defects are studied by extensive first-principles calculations. It is shown that the asymmetry distribution of the Stone-Wales defects can induce finite magnetic moment in the defective ZGNRs. As the defect near one of the ribbon edges moving to the centre region, the magnetic moment of the defective ZGNRs gradually decreases to zero, following a transition from metal to semi-half-metal and eventually to semiconductor. In addition, by symmetrically placing an additional defect at the opposite side of the defective ZGNRs, the finite magnetic moment vanishes, and the electronic properties depend on the distance between the defect and the closer ribbon edge. These findings are robust within a wide range of defect concentration. (C) 2009 Elsevier B.V. All rights reserved.
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